diff --git a/demos/gtk-demo/tree_store.c b/demos/gtk-demo/tree_store.c
index 86683e9..2a1e65f 100644
--- a/demos/gtk-demo/tree_store.c
+++ b/demos/gtk-demo/tree_store.c
@@ -70,6 +70,44 @@
 ..............................................................................*/
 
 
+
+/*..............................................................................
+ *
+ *    >>>   GtkStringList   <<<
+ *
+ * GtkStringList is a list model that wraps an array of strings.
+ * The objects in the model are of type GtkStringObject
+ * and have a “string” property that can be used inside expressions.
+ * Use it where/when you would typically use a char*[], but need a list model.
+ *
+ * implements GtkBuildable interface
+ * <item> are GObject instances; support “translatable”, “context” and “comments”
+ *
+ * <object class="GtkStringList">
+ *   <items>
+ *     <item translatable="yes">Factory</item>
+ *     <item translatable="yes">Home</item>
+ *     <item translatable="yes">Subway</item>
+ *   </items>
+ * </object>
+ *
+ * Every item in a model has a position (= unsigned integer)
+ * "factories" takes care of mapping the items of the model
+ *      to widgets that can be shown in the view
+ *      by creating a listitem for each item that is currently in use.
+ * List items are always GtkListItem instances. Widgets can be recycled.
+ *
+ * GtkStringList can only handle strings. It is backed by a dynamically allocated array.
+ * GListStore is backed by a balanced tree.
+ *
+ * GTK provides functionality to make lists look and behave like trees
+ * by using the GtkTreeListModel and the GtkTreeExpander widget.
+ *
+ * Widgets are styleable using GTK CSS. Use the .rich-list style class.
+ *
+ *............................................................................*/
+
+
 #include <gtk/gtk.h>
 #include <stdio.h>
 #include "config.h"
@@ -130,11 +168,11 @@ static void iterating_a_model_in_a_depth_first_fashion (GtkTreeModel *model)
   gtk_tree_model_get (model, &iter, STRING_COLUMN, &str_data, -1);
   g_print ("first row %d: (%s)\n", row_count, str_data);
 
-  gtk_tree_model_iter_children (model, &iter_parent, &iter);
-  gtk_tree_model_iter_children (model, &iter, &iter_parent);  //  Sets iter to point to the first child of parent.
-  //gtk_tree_model_iter_next (model, &iter);
-  gtk_tree_model_get (model, &iter, STRING_COLUMN, &str_data, -1);
-  g_print ("next row %d: (%s)  <  False  (should be 'A'   <-- line 104)\n", row_count, str_data);
+  /* gtk_tree_model_iter_children (model, &iter_parent, &iter); */
+  /* gtk_tree_model_iter_children (model, &iter, &iter_parent);  //  Sets iter to point to the first child of parent. */
+  /* //gtk_tree_model_iter_next (model, &iter); */
+  /* gtk_tree_model_get (model, &iter, STRING_COLUMN, &str_data, -1); */
+  /* g_print ("next row %d: (%s)  <  False  (should be 'A'   <-- line 104)\n", row_count, str_data); */
 
  /*  while (valid) first row 0: (ROOT)  next row 0: (D)*/
  /* { */
@@ -231,6 +269,41 @@ static GtkTreeModel *create_node_recursive (GtkTreeStore *model,
 }
 
 
+/* static GListModel *create_node_recursive (GTreeListModel *model, */
+/*                                           guint current_position, */
+/*                                           TreeItem *current_item, */
+/*                                           guint parent_position, */
+/*                                           int depth) */
+/* { */
+/*   if (model == NULL) */
+/*       model = gtk_tree_list_model_new (GListModel* root, */
+/*                                   gboolean passthrough, */
+/*                                   gboolean autoexpand, */
+/*                                   GtkTreeListModelCreateModelFunc create_func, */
+/*                                   gpointer user_data, */
+/*                                   GDestroyNotify user_destroy */
+/*                                 ); */
+
+/*   while (current_item->label) { */
+/*     if (0) printf("[%d] Current label : %s\n", depth, current_item->label); */
+/*     gtk_tree_store_append (model, &iter, iter_parent); */
+/*     gtk_tree_store_set (model, &iter, STRING_COLUMN, current_item->label, -1); */
+
+/*     if (current_item->children) */
+/*       create_node_recursive (model, current_item->children, &iter, depth + 1); */
+/*     else */
+/*       break; */
+
+/*     current_item++; */
+/*   } */
+
+/*   if (depth == 0) */
+/*     return GTK_TREE_MODEL(model); // cast from GtkTreeModel to GtkTreeStore */
+/*   else */
+/*     return NULL; */
+/* } */
+
+
 GtkWidget *
 do_tree_store (GtkWidget *do_widget)
 {
@@ -241,9 +314,11 @@ do_tree_store (GtkWidget *do_widget)
       GtkWidget *vbox;
       GtkWidget *sw; // sw : 'scrolled_window'
       GtkWidget *treeview;
-      GtkTreeModel *my_tree_model;
-      GtkTreeStore *my_tree_store = NULL;  //  The GtkTreeStore is used to store data in tree form,
-                                        //  to be used later on by a GtkTreeView to display it.
+      GtkTreeModel *my_tree_model; /////
+      GListModel *my_list_model;
+      GtkTreeStore *my_tree_store = NULL; /////
+      GtkTreeListModel *my_tree_list_model;
+
       /* create window, etc */
       my_window = gtk_window_new ();
       gtk_window_set_title (GTK_WINDOW (my_window), "Tree Store");
@@ -267,11 +342,12 @@ do_tree_store (GtkWidget *do_widget)
 
       /* create tree_model */
       my_tree_model = create_node_recursive (my_tree_store, O, NULL, 0);
+   //   my_list_model = create_node_recursive (my_tree_list_model, O, NULL, 0);
       iterating_a_model_in_a_depth_first_fashion (my_tree_model);
    //   GtkTreePath *my_path = gtk_tree_path_new_from_string ("0:0:1:0:1");
    //   acquiring_a_GtkTreeIter (my_tree_model, my_path);
-      GtkTreeIter *my_iter;
-      gtk_tree_model_get_data_from_iter (my_tree_model, NULL, my_iter, NULL, gtk_tree_path_new_from_string ("0:0:0:1:0:1"));
+   //   GtkTreeIter *my_iter;
+   //   gtk_tree_model_get_data_from_iter (my_tree_model, NULL, my_iter, NULL, gtk_tree_path_new_from_string ("0:0:0:1:0:1"));
 
       /* create tree view */
       treeview = gtk_tree_view_new_with_model (my_tree_model);